Expert Level 2
The Android Q release date is a significant step closer today, as Google has launched the first developer beta.
You can expect to download Android 10 Q in August, according to Google's official developer beta timeline. That's in case you don't want to install an unfinished beta. 
You can also expect new Android Q features to debut at Google IO 2019 on May 7 at the company's keynote in Mountain View, California (we'll be there covering it live).
Before Google IO, we have a list of early Android Q features we know about already thanks to the ongoing beta, and an idea of when the software will roll out to various smartphones and tablets. Right now, we're mostly answering these questions through historical data and leaks, and we'll know more concrete facts as Google IO 2019 approaches.
 March 13: The first Android 10 developer beta has launchedEarly April: No joke, we'll get Android Q beta 2 on or around April 1Early May: Android Q developer beta 3 is due near May 1Early June: The final incremental update, beta 4, should land in JuneJuly: Beta 5 and beta 6, release candidates, may land this monthAugust: The final release has routinely happened in August
Android Q features
 With the public reveal of the first Android Q developer beta, Google officially confirmed a chunk of features coming in the full update. It's unclear if they're all available in the first release or which will be added in a later beta, but at least we know some of what's coming. Of course, Google is keeping some of the fun new features close to the chest. Some of the more newsworthy ones will probably be revealed at Google IO 2019, while others will be unveiled with further beta versions. However, we may have a heads-up on which features to expect from Google's mobile operating update thanks to leaks.  
Developers will be able to show contextually-important system settings within their apps, which harnesses the 'Slices' feature that came in Android 9 Pie. So instead of having to navigate to Settings to switch on Airplane Mode or toggle Wi-Fi or Mobile Data on/off, say, you'll be able to do that right within your mobile browser. There are also tweaks to connectivity, including 'adaptive Wi-Fi' that enables high performance/low latency modes, which would be useful for things like online gaming or voice calls. Like all the depth and blur in Pixel camera software? In Android Q, apps can request depth data (JPEG + XMP metadata + depth and confidence map) to, say, offer "specialized blurs and bokeh options in your app," as the Android post suggests. "You can even use the data to create 3D images or support AR photography use-cases in the future." Android Q will also support more multimedia codecs: AV1 to let media providers stream high-quality video, Opus for audio encoding, and HDR10+ for high dynamic range video "on devices that support it" – like, say, the Samsung Galaxy S10 family. As for gaming, the Android Q beta enhances support for OpenGL along with bug fixes and more functionality.